Find out what percentage of a number is a word problem

Percentage practice questions.

1. A is 2, B is 3, A is B ( ) B is a ( ) A is the sum of A and B ( ) B is the sum of A and B ( ) How many percent is in parentheses).

2. A is 25% of B, and the ratio of A to B is ( ) A is the sum of A and B ( ) B is the sum of A and B ( ).

3. A is 2 3 of B, B is 3 4 of C, the sum of A, B and C is 216, what is A, B and C?

4. A is 5 6 of B, B is 3 4 of C, the sum of A, B and C is 152, what is A, B and C?

5. In a mathematics test, student A scored 100 points and student B scored 80 points.

1) How many points does student A get more points than student B? How many percent more?

2) Student B is better than Student A.

How many points do classmates get less? How many percent less?

6. A is 12, B is 10% of A, what is B? If A is 20% of C, then what is C?

7. (1) A is 12, B is 25% more than A, what is B? Please write two ways to find it.

2) B is 12, B is 25% more than A, what is A?

8. (1) Student A has 60 yuan, and student B has 20% more money than student A. How much money does student B have?

2) Student B has 70 yuan, student B has 20% more money than student A How much money does student A have?

9. (1) The height of the teacher is 170 cm, and the student is 10% shorter than the teacher, what is the height of the student?

2) The height of the student is 135 cm, and the student is 10% shorter than the teacher.

10. (1) There are 60 students in the first class of the fifth grade, and the second class of the fifth grade is 10% less than the first class.

2) There are 45 students in the second class of the fifth grade, and the second class of the fifth grade is 10% less than the first class, how many students are in the first class of the fifth grade?

11. The shoe factory produces leather shoes, and the double number produced in October is 125% of the double number produced in September. 2000 pairs were produced in October, how many pairs were produced in September?

12. Master Zhang processes a batch of parts, and the number of parts completed on the first day accounts for 1 3 of the total number of parts. If you reprocess 15 pieces, you can complete 50% of this batch of parts. How many parts are in this batch?

13, Xiaohong reads a storybook. I read 45 pages on the first day, 25% of the book on the second day, and exactly 20% more pages on the second day than on the first day. How many books are there in total.

This kind of problem can barely be counted as a practical problem. The solution is:

Percentage of known percent = original number.

For example, if you know that 20% of a number is 5, find the original number. Then:

The original number is 25

Just rewind it and calculate it, it's very simple.

Here's an example. 2 percent of a certain number is 3

Then this number is 3 2% = 150

I don't believe you can verify it.

Finding a number is a hundredth of another number practice problem.

1.For a project, A does it alone in 10 days and B does it alone in 8 days, how many percent less does A do than B every day?

2.A factory expansion plan invests 5 million yuan, and the actual savings are 450,000 yuan, how many percent of the investment is saved?

3.To do a single job, A takes 8 days, 2 days less than B, and how many percent faster is A's work efficiency than B?

4.A sugar factory produced 552 tons of sugar in July, 72 tons more than planned, how many percent overproduction?

5.The washing machine factory planned to produce 450,000 washing machines in January, but actually produced 480,000 units, an increase of several percent?

6.A mobile phone was originally 450 yuan per unit, but after the price reduction, each unit was 300 yuan, how many percent of the price was reduced per unit?

7.A production team produces 1600 parts, and after acceptance, there are 4 unqualified, find the pass rate of the product?

8.There are 1,350 male and 1,890 female workers in the textile mills, how many percent more women than men?

9.Huaxi Village has accumulated 820,000 tons of fertilizer this year, 140,000 tons more than the original plan.

10.The school biology team used 250 soybeans to do a germination test, and the results showed that 15 soybeans did not germinate, and the germination rate of the seeds was found.

11.Dissolve 20 grams of salt in 80 grams of water to find the salt content of the brine?

12.A kind of color TV, now 2400 yuan per unit, 350 yuan lower than the original price per unit, how many percent of the price reduction?

13.The school canteen burned tons of coal in May, saving tons compared to April, how many percent of the savings?

14.The time for a worker to process a machine part is reduced from 15 minutes to 10 minutes, and the working time is reduced by how many percent? How many percent has the productivity improved?

15.In a shooting exercise, Zhang Jun hit 200 bullets and missed 50 rounds, what was the hit rate?

16.A kind of tape recorder now costs 550 yuan per unit, which is 100 yuan lower than the original, and the cost is reduced by how many percent?

17.A steel mill produced 2,460 tons of steel in August, an increase of 60 tons over the plan, an increase of several percent?

18.A factory planned to produce 1,820 machine parts in the first quarter, but actually produced 2,320, an increase in production by a fraction?

It's more abstract to describe it in words, so let's give you a concrete example:

20% of a number is equal to 10, then this number = 10 20% = 10 100 20 = 50

It is known what percentage of a number is divided by a percentage to equal this number. For example, if you know that 25 percent of a number is 75, this number is 75 25% = 300.

There are 27 boys and 23 girls in the first class of the sixth grade, so what percentage of the class is boys?

For example, if there are 450 workers in a factory, of which there are 250 male workers, there are no more male workers than female workers ()% can ask for 450-250=200 female workers, and the female wheel book worker is unit one, then the equation is (250-200) 200=25%, and the blank is filled in, and similarly, the female worker is less ()% than the male worker is (250-200) 250=20%.

Read a book, read 12% of the whole book every day, and after 5 days of reading, there are 80 pages left. Ask for several pages in this book.

It is known that the number A is 20% more than the number B, and the number B is a fraction less than the number A.

If the original number is x, it is more than a%.

The answer is (1+a 100)x

Multiply this number by the percentage you know.

For example, 40% of 25% is.

This number = a few percent of the percentage.

Find out what fractions or hundredths of a number are special exercises.

Uncle Zhang's family collected 1,000 kilograms of apples last year, one-fifth more this year than last year. How many kilograms of apples have been harvested this year?

This year, 1,200 kilograms of apples were harvested.